Spark plug adjustment tool



DOC. 27, 1949 5, DUMA 2,492,380

SPARK PLUG ADJUSTMENT TOOL Filed Aug. 17, 1946 INVENTOR. S'IEPHEK DUMA.

Patented Dec. 27, 1949 UNITED STATES PATENT OFFICE SPARK PLUG ADJUSTMENT TOOL Stephen Duma, New York, N. Y. Application August 17, 1946, Serial No. 691,301

2 Claims. 1

The present invention concerns a spark plug tool and refers more particularly to a combination tool for more conveniently setting the spark plug gap and gauging the same.

An object of the present invention is to provide a combination tool comprising a multiplicity of gap gauges and convenient associated means for setting the gap of a spark plug.

A further object is to provide a tool of the character described in which the gap setting operation is rendered simple and easy and the magnitude of gap change is readily estimated and controlled.

Another object is that the described tool shall be simple in design and construction, cheap to fabricate and durable in use.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended claims in which the various novel features of the invention are more particularly set forth.

In the accompanying drawing forming a material part of this disclosure:

Fig. 1 is a side elevation of the preferred embodiment of the invention in operative position on a spark plug.

Fig. 2 is a perspective view of the handle component of the same.

Fig. 3 is a side elevation of a modified form of the invention, also in operative position on a spark plug.

Fig. 4 is a top elevation of the same.

Referring now in detail to the drawings, the invention is shown in its preferred form in Figs. 1 and 2, the tool I comprising a handle portion II, bracket I2 extending substantially perpendicularly thereto, a gauge disc I3 rotatably mounted on bracket I2 by means of shaft I4, and a plurality of wire gauges I5, I6, I1 and I8 extending radially therefrom comprising operative gauging portions I3, 20, 2I and 22 extending in the plane of rotation and tangentially to their path of rotation 23.

The portions I9, 20, 2| and 22 are thus adapted to be brought selectively into operative gauging position between the central electrode 24 and the radial electrode 25 of a spark plug 26 by rotation of disc I3. Disc I3 is laterally spaced a substantial distance from bracket I2 and a light coil spring 21 is compressed between the two and surrounding shaft I4. Friction between spring 21 and disc I3 tends to keep the latter in any position to which it is set. The central bore 28 of disc I3 is larger than shaft I4 so that disc I3 2 fits loosely thereon for reasons hereafter to appear.

Handle II has a recess 29 formed therein and a further recess 30 openly communicating therewith. Bracket I2 is set in recess 29 and firmly joined to handle II by cementing, soldering, welding or in any convenient manner. In the assembled tool, recess 30 is therefore defined by bracket I2 and finger 3I, and the tool III is capacitated to engage electrode 25 between the two last mentioned portions, and by bending electrode 25, to set the gap between electrode 25 and electrode 24. Such bending is accomplished by movement of handle II in the direction of either of the arrows in Fig. 1.

It may be desired to carry out the gap setting operation with an operative gauging portion I9, 20, 2i or 22 in the gap, and in such case handle II and bracket I2 may be moved as indicated in Fig. 1 while disc I3 and the gauges may be maintained in position between the electrodes, the loose fit of disc I3 on shaft I4 permitting this. Disc I3 may be also moved axially of shaft I4 against spring 21 in order to accommodate for variations in the exact position and size of gap from one spark plug to another.

In a modified form of the invention shown in Figs. 3 and 4, bracket 32 has a gentle 8 curve between its two parallel end portions, and the clearance between the bracket and disc 33 is small. Disc 33 is similar in general to disc I3 and the gauges mounted thereon are or may be identical, the differences from disc I3 being that disc 33 fits the shaft 34 on which it is mounted more snugly, so as to maintain a parallel relation between it and bracket 32. Bracket 32 has a socket 35 in which a ball 36 is positioned and actuated outwardly by a spring 31. Disc 33 is formed with a plurality of partispherical recesses 38 into which ball 36 is urged as each of the gauges comes into gauging position, thus a click mechanism is constituted which tends to look any one of the gauges in gauging position.

While I have illustrated and described the preferred embodiments of my invention, it is to be understood that I do not limit myself to the precise constructions herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention as defined in the appended claims.

Having thus described my invention, what I claim as new, and desire to secure by United States Letters Patent is:

1. In a spark plug tool for setting and gauging the gap between the central and the radially extending electrodes of a spark plug, a vertically extending lever means which is slotted on one side to engage the radial electrode for bending said electrode in either direction relative to the central electrode, a horizontally extending bracket mounted on said lever means, at least one wire gauge movably supported by said bracket for movement into and out of gauging position between the two electrodes, whereby the gap between said electrodes may be gauged at the same time that the radial electrode is bent by the lever means to adjust the gap between said radial electrode and the central electrode.

2. In a spark plug tool for setting and gauging the gap between the central and radially extending electrodes of a spark plug, a handle formed with a slot in one end for engaging the radial electrode and bending the same toward and away from the central electrode, a bracket extended radially from one side of said handle, a gauge discerotative y-suppol d on sai acke o urn in a plane extended at right angles to the length .of said handle, wire gauges extended radially from the periphery ofsaid gauge disc to be moved REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,384,209 OToole July 12, 1921 1,431,708 Tisdale et al Oct. 10, 1922 1,990,430 Fitzgerald May 17, 1927 1,985,410 Isaacs Dec. 25, 1934 2,237,378 Thienemann Apr. 8, 1941 2,313,174 Shock Mar. 9, 1943 

